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I just had installed (yesterday) a Navien NPE-240A. After 24 hours I'd say it's doing great - but I sure would hope it's doing great after only 24 hours. LOL Can someone explain how the internal tank and internal recirc actually works? (I don't have a recirc loop in the house - so it's not...

I'm very close to signing a contract on a tankless install. (It could happen tomorrow - which is why I hope I can get input ASAP here.) I live in northern CO. If I assume a winter cold water temp of 40 degrees F I need to have a 75-80 degree raise to get it to 120. The spec sheet for the...